Thanks for all the insights! We had a productive meeting with DS6's "gifted team" at school (including the principal).

The team approved an acceleration if we want to go that route, but also said that they are implementing 'cluster grouping' starting next year and that this might meet DS's needs.

Has anyone had experiences experiences with cluster grouping? Can it be a good substitute for grade acceleration? Are there are particular questions I should ask about it?

Ul.H.